Tennessee county soil & foundation guides

Foundations fail according to what is under them. These 50 county guides cover bedrock, soil, depth to rock and the dominant local failure mode.

Valley and Ridge

Differential settlement over pinnacled limestone — rock at 3 ft under one corner and 30 ft under another.

Anderson CountyBlount CountyBradley CountyCarter CountyClaiborne CountyGreene CountyHamblen CountyHamilton CountyHawkins CountyKnox CountyLoudon CountyMarion CountyMcMinn CountyMonroe CountyRhea CountyRoane CountySevier CountySullivan CountyWashington County

Central Basin (Outer)

Differential settlement over variable residuum depth.

Bedford CountyGiles CountyLincoln CountyMacon CountyMarshall CountyMaury CountySmith CountySumner CountyWilliamson CountyWilson County

Eastern Highland Rim

Sinkhole collapse and settlement in deep compressible residuum.

Cannon CountyCoffee CountyDeKalb CountyOverton CountyPutnam CountyWarren County

Western Highland Rim

Perched water tables in chert-clay causing chronically wet crawl spaces.

Cheatham CountyDickson CountyHumphreys CountyLawrence CountyMontgomery CountyRobertson County

Cumberland Plateau

Chronic crawl space moisture from poor drainage and high rainfall, not sinkholes.

Cumberland CountyFentress CountyFranklin CountyGrundy CountyMorgan CountySequatchie County

Central Basin (Inner)

Sinkhole subsidence and differential settlement where soil depth varies over pinnacled rock.

Davidson CountyRutherford County

Blue Ridge / Unaka

Slope creep and colluvial movement on steep building sites.

Unicoi County